Nobody these days setting records in rifle matches uses Lee collet dies. They never ever did.

Full length bushing dies have been the thing to use for several years in benchrest and for decades in shoulder fired rifle matches.

And Sierra Bullets has been full length sizing all their cases used to test bullets for accuracy in benchrest quality rail guns with the very best match grade barrels with SAAMI spec chambers (or virtual copies thereof) and I doubt anyone shoots their stuff more accurate than they do.